如图:△ABC中,∠A的同旁内角是____ .
下列能与维生素C呈现褪色反应的物质是( )
—How many ________ are there on the table?
—Three. Are you thirsty? Let's cut one and eat it.
每逢暴雨,贵州山区容易引发的地质灾害是( )
下图是人类不同发展阶段就业结构变化图,读图完成下列问题。